Strain insulator



L. STEINBERGER STRAIN INSULATOR Filed Sept. 23, 1921 Aug. 11, 1925,

, IP'IVEVNTOR 46 Lou/s 57em/Je/ ger QLWOQWN Patented Aug. 11, 1925.

LOUIS STEINBERGER, OF BROOKLYN, NEW YORK.

STRAIN INSULATOR.

Application filed. September 23, 1921. si-iai No. 502,658.

To'aZZ whom it may concern:

Be it known that I, LOUIS STEINBERGER, acitizen of the United States,and a resident of the borough of Brooklyn, city and State of New York,have invented certain new and useful Improvements in Strain Insulators,of which the following is a specification.

This invention relates to insulators for the support and insulation ofelectric conductors employed tormany purposes such as wirelesstelegraphy and telephony and in various kinds of electric powertransmission and especially constructed for use in connection withcurrents out very high voltages and very high frequencies.

The particular object of my invention is to improve the construction ofsuch insulators, so as to render them proof not only against thedestructive effects of high frequency currents, but also against thedestructive effects of lightning, and at the same time simplify theconstruction and decrease the cost thereof.

Another object is to provide an insulator with arcing means, each memberof which situated upon the same side of the in sulator body.

Another object is to so mount the arcing members that they will not onlybe situated upon thesame side of the insulator body, but are disposeddirectly opposite to each other.

Other objects will appear from the subjoined specification and claims.

Referring to the drawings in which the same reference characterindicates the same part in the several views:

Fig. 1 is a cross section of an insulator embodying my invention,portions of the construction being shown in elevation.

Fig. 2 is a section on line 2 2 of Fig. 1, with portions shown inelevation and other portions broken away.

Fig. 3 is a section on line 3-8 of Fig. 1.

In the drawings, A is a body formed of suitable insulating material,preferably that material known in the art as electrose. The body may bemolded or constructed in any preferred shape with the sole exception ofthe depression in one end thereof which will be hereinafter specificallydescribed. Preferably the side of the body is provided with alternategrooves and flanges inorder to lengthen the creepage surface thereof andalso to form watersheds. B is an integral strain member molded to theinsulator body, as shown, and O is a two-part strain member, one portionof which is molded to the insulator body, as shown, and is thus causedto interlock with the integral strain member B, the projecting ends 11and 12 of the embedded portion 10 being screwthreaded, as shown.

The removable portion of the strain member C is constructed in themanner known in the art so that it may be readily secured to theembedded portion 10 of the strain member C. One, end of the portion 20is provided with a screwthreaded cavity 21 which engages with thescrewthreaded end 11 of the portion 10. The screwthreaded end 22 of theportion 20 is placed opposite the fixed projecting end 12 of the portion10 and a screwthreaded nut n is caused to engage the screwthreads ofboth parts 12 and 22 in order to hold the portion 20 of the strainmember in place, which nut is run up into the screwthreads 22 clear ofthe screwthreads 12 when a disengagement of these parts is desired.

A cavity D is formed in one of the ends of the insulator body A and thebottom of the cavity is so shaped that the strain member B is exposed tothe atmosphere at its central portion Z). A screwthreaded cavity 15 isformed in the center of the exposed portion 6 of the strain member B andthe screwthreaded shank 31 of the arcing member 30, which is providedwith an enlarged rounded head, engages said screwthreaded cavity 15 sothat the arcing member may be adjustably mounted upon the strain memberB.

A bar or bridge portion E is provided with a centrally depressed portionand it supports an opposing arcing member 40, the head of which issimilar in shape and contour to that of the arcing member 30. The member40 is secured to the centrally depressed portion of the bar or bridge Eby a screw bolt -12 engaging a screwthreaded cavity 43 therein. The endsof the bridge member E are provided with holes or open ings 45 and 4.6which fit respectively over the projecting ends 12 and 11 of the part 10of the strain member C and is held in place by the enlarged ends 21 ofthe member 20 and by the nut 11, each of which engages the respectiveends of the bridge member E when the removable portion 20 is secured inplace.

As will be readily understood from the above construction, the arcingmembers and a0 are adjustably mounted in fixed relation to each otherupon the same side of the insulator body, each arcing member beingsecured to the respective strain. men'ibers in the same axial line.

From the above description it will be seen that by nesting the arcingmembers so that they will be situated opposite to each other upon oneside only of the insulator, I have made a simple and compactconstruction as distinguished from those constructions provided withfree projecting arms extending over the insulating body when the arcingmembers are mounted one upon each side of that body.

Another benefit resulting from my construction over those which haveextending supporting arms is that the danger of accumulating dirt,twigs, hay or any other thing which may be blown upon the insulator isreduced to a minimum. Moreover, the danger of bending or breaking theprojectin arcing member supporting arm is obviated or greatly lessened.

As changes of construction could be made *ithin the scope of myinvention, it is intended that all matter contained in the abovedescription or shown in the accompanying drawings shall be interpretedas illustrative and not in a limiting sense.

Having now described my invention, what I claim as new and desire tosecure by Letters Patent is:

1. An insulator provided with a strain member secured to the bodythereof, the inner end of said strain member being ere posed to theatmosphere, and an arcing member secured to the exposed portion of saidinner end, a bridge member secured to the opposing strain member uponthe same side of the insulator body and provided with an arcing membersecured to the central portion thereof.

neeaeae 2. An insulator provided with a strain member partially embeddedtherein, the inner part of said strain member being exposed. to theatmosphere, an arcing member secured to the exposed portion of saidstrain member, a bridge portion rigidly but removably secured to theprojecting portions of the opposing strain member, and a separate andindependent arcing member secured to the central portion of said bridgemember and situated opposite to the said first mentioned arcing memberin the line of the axis of the insulator, both arcing members beingmounted on one side only of the insulator body.

An insulator having a body portion of insulating material, strainmembers partially embedded in the body portion both projecting from oneside of the body porrn, and arcing means consisting of members securedto the respective strain members upon the aforesaid side of theinsulator body portion.

in an insulator, a body of insulating material provided with a cavityupon one face thereof, strain members secured to the body of insulatingmaterial, the inner portion of one of said strain members projettinginto said cavity, an arcing member secured to said inner portion of thestrain member, a bridge member extending across said cavity and securedto the other strain membe the bridge member having an arcing membersecured to the central portion thereof and oppositely disposed to thementioned arcing member upon the same side of the insulator body.

in witness whereof, I have hereunto set my hand at the borough ofManhattan, city and State of New York, this 15 day of i'iiPPlJLlIilJGl,1921.

LOUIS STEINBERGER.

In presence of ISABEL R. FLETCHER.

